Post on 08-Jan-2016
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CGs to EPDsCGs to EPDs
2006 BIF Symposium2006 BIF SymposiumSponsored by Ultrasound Guidelines Sponsored by Ultrasound Guidelines
CouncilCouncilDr. Lisa A. Kriese-AndersonDr. Lisa A. Kriese-Anderson
Auburn UniversityAuburn University
Would you purchase a Would you purchase a bull ….bull ….
Would you purchase a Would you purchase a bull ….bull ….
This top young son of Superbull had a weaning weight of 636 lbs
Would you purchase a Would you purchase a bull ….bull ….
This top young son of Superbull had a weaning weight of 636 lbs
An exceptional p
rospect
with a sc
rotal
circumference of 3
5 cm
So, why would you So, why would you consider….consider….
So, why would you So, why would you consider…consider…
So, why would you So, why would you consider…consider…
Ultrasound BasicsUltrasound Basics
Individual ultrasound measurements Individual ultrasound measurements (adjusted) are as useful as individual (adjusted) are as useful as individual weights and measuresweights and measures Really only mean something within the group Really only mean something within the group
they came fromthey came from Ratios are betterRatios are better EPDs for ultrasound or carcass are best for EPDs for ultrasound or carcass are best for
selection decisionsselection decisions
Ultrasound Genetics RefresherUltrasound Genetics Refresher
Ultrasound measurements should be Ultrasound measurements should be taken the same time as yearling weightstaken the same time as yearling weights Generally 320/330 to 410/430 days of ageGenerally 320/330 to 410/430 days of age
BIF says 335 to 395 daysBIF says 335 to 395 days Entire contemporary group should be Entire contemporary group should be
measured by a certified ultrasound technicianmeasured by a certified ultrasound technician Genetically, ultrasound measurements for Genetically, ultrasound measurements for
carcass traits are highly correlated to actual carcass traits are highly correlated to actual carcass traitscarcass traits But they are not the same traitsBut they are not the same traits
Ultrasound Genetics RefresherUltrasound Genetics Refresher
Genetic Correlation Estimates Among Yearling Genetic Correlation Estimates Among Yearling Ultrasound and Carcass TraitsUltrasound and Carcass Traits
UBF and BFUBF and BF 0.75 to 0.800.75 to 0.80
UREA and REAUREA and REA 0.70 to 0.750.70 to 0.75
IMF and MarblingIMF and Marbling 0.60 to 0.680.60 to 0.68
Ultrasound Genetics RefresherUltrasound Genetics RefresherGenetic Correlation Estimates Among Yearling Genetic Correlation Estimates Among Yearling
Ultrasound and Carcass TraitsUltrasound and Carcass Traits
UBF and BFUBF and BF 0.75 to 0.800.75 to 0.80
UREA and REAUREA and REA 0.70 to 0.750.70 to 0.75
IMF and MarblingIMF and Marbling 0.60 to 0.680.60 to 0.68
Reminder – if you do not report any carcass data, individual animal accuracy can only be a high as the genetic correlation
Genetic EvaluationGenetic EvaluationBegins withBegins withP = G + EP = G + E
In Genetic In Genetic EvaluationEvaluation
E ≈ Contemporary E ≈ Contemporary GroupGroup
Contemporary GroupContemporary Group A contemporary group is a group of A contemporary group is a group of
animals with the same:animals with the same: HerdHerd SexSex Birth SeasonBirth Season Weigh dateWeigh date ManagementManagement
The largest contemporary group is at The largest contemporary group is at birth. All subsequent traits are birth. All subsequent traits are subsets of the birth contemporary subsets of the birth contemporary group.group.
In Simplest Terms:In Simplest Terms:
BV = hBV = h22 x SD x SD
SD = Selection DifferentialSD = Selection DifferentialSD = (individual – avg of SD = (individual – avg of
group)group)
Example DataExample DataNoNo SirSir
eeDaDamm
CGCG WWWW PWPW REREAA
BFBF IMIMFF
60060011
11 100100 11 781781 486486 11.11.55
0.30.300
4.24.255
60060022
11 101101 11 626626 522522 11.11.55
0.20.211
4.24.211
60060033
22 102102 11 845845 357357 11.11.33
0.20.288
4.34.355
60060044
22 103103 11 713713 482482 11.11.22
0.10.188
2.82.899
60060055
22 104104 22 663663 397397 10.10.11
0.10.177
4.54.599
60060066
33 105105 22 720720 532532 10.10.66
0.40.444
5.25.200
60060077
33 106106 33 720720 539539 12.12.55
0.10.199
3.83.822
60060088
44 107107 22 841841 562562 15.15.11
0.30.322
3.93.900
60060099
44 108108 33 865865 510510 11.11.99
0.30.311
4.44.444
Data AnalysisData Analysis
Multiple-trait animal modelMultiple-trait animal model WW, PWG, UREA, UBF, %IMF in WW, PWG, UREA, UBF, %IMF in
analysisanalysis Examine Sire Rankings for above Examine Sire Rankings for above
traitstraits
Sire EPD Rankings Sire EPD Rankings TraitTrait
WWWW MilkMilk PWGPWG UREAUREA UBFUBF IMFIMF
44 44 44 44 22 11
22 22 11 11 11 33
11 11 33 33 44 22
33 33 22 22 33 44
Example Data – Just 1 CGExample Data – Just 1 CGNoNo SirSir
eeDaDamm
CGCG WWWW PWPW REREAA
BFBF IMIMFF
60060011
11 100100 11 781781 486486 11.11.55
0.30.300
4.24.255
60060022
11 101101 11 626626 522522 11.11.55
0.20.211
4.24.211
60060033
22 102102 11 845845 357357 11.11.33
0.20.288
4.34.355
60060044
22 103103 11 713713 482482 11.11.22
0.10.188
2.82.899
60060055
22 104104 11 663663 397397 10.10.11
0.10.177
4.54.599
60060066
33 105105 11 720720 532532 10.10.66
0.40.444
5.25.200
60060077
33 106106 11 720720 539539 12.12.55
0.10.199
3.83.822
60060088
44 107107 11 841841 562562 15.15.11
0.30.322
3.93.900
60060099
44 108108 11 865865 510510 11.11.99
0.30.311
4.44.444
With Wrong CG With Wrong CG DefinitionsDefinitions
Do not have correct comparisons in dataDo not have correct comparisons in data Sires are compared in “head to head” Sires are compared in “head to head”
competition that were notcompetition that were not Basics of EPD analysis is to find the group Basics of EPD analysis is to find the group
average and subtract the individual measurement average and subtract the individual measurement from itfrom it
Group mean is wrong!Group mean is wrong!
Comparing Sire Ranks – Comparing Sire Ranks – Wrong CGWrong CG
TraitTrait
WWWW MilkMilk PWGPWG UREAUREA UBFUBF IMFIMF
44 44 44 44 22 1/31/3
2/12/1 22 1/31/3 1/21/2 11 3/13/1
1/31/3 1/31/3 3/13/1 3/13/1 4/34/3 2/42/4
3/23/2 3/13/1 22 2/32/3 3/43/4 4/24/2
Not Reporting All DataNot Reporting All DataNoNo SirSir
eeDaDamm
CGCG WWWW PWPW REREAA
BFBF IMIMFF
60060011
11 100100 11 781781 486486 11.11.55
0.30.300
4.24.255
60060022
11 101101 11 00 00 00 00 00
60060033
22 102102 11 845845 357357 11.11.33
0.20.288
4.34.355
60060044
22 103103 11 713713 482482 11.11.22
0.10.188
2.82.899
60060055
22 104104 22 663663 397397 10.10.11
0.10.177
4.54.599
60060066
33 105105 22 720720 532532 10.10.66
0.40.444
5.25.200
60060077
33 106106 33 720720 539539 12.12.55
0.10.199
3.83.822
60060088
44 107107 22 841841 562562 15.15.11
0.30.322
3.93.900
60060099
44 108108 33 865865 510510 11.11.99
0.30.311
4.44.444
By Not Reporting All By Not Reporting All DataData
If not sending in “bottom-If not sending in “bottom-performing” cattle, penalize the restperforming” cattle, penalize the rest Group means are incorrect once againGroup means are incorrect once again Competition is not reported accuratelyCompetition is not reported accurately
By Not Reporting All By Not Reporting All DataData
TraitTrait Mean – All Mean – All datadata
Mean-Select Mean-Select DataData
WWWW 753 ± 85 lbs753 ± 85 lbs 769 ± 75 lbs769 ± 75 lbs
PWGPWG 487 ± 68 lbs487 ± 68 lbs 483 ± 72 lbs483 ± 72 lbs
UREAUREA 11.7 ± 1.4 sq 11.7 ± 1.4 sq inin
11.8 ± 1.5 sq 11.8 ± 1.5 sq inin
UBFUBF 0.27 ± .09 in0.27 ± .09 in 0.27 ± .09 in0.27 ± .09 in
IMFIMF 4.2 ± .63%4.2 ± .63% 4.2 ± .67%4.2 ± .67%
Sire EPD Ranks – Sire EPD Ranks – Incomplete DataIncomplete Data
TraitTrait
WWWW MilkMilk PWGPWG UREAUREA UBFUBF IMFIMF
44 44 44 44 22 1/31/3
2/12/1 2/12/1 11 11 11 3/13/1
1/31/3 1/21/2 33 33 44 22
3/23/2 33 22 22 33 44
Not Reporting All DataNot Reporting All DataNoNo SirSir
eeDaDamm
CGCG WWWW PWPW REREAA
BFBF IMIMFF
60060011
11 100100 11 781781 486486 11.11.55
0.30.300
4.24.255
60060022
11 101101 11 00 00 00 00 00
60060033
22 102102 11 845845 357357 11.11.33
0.20.288
4.34.355
60060044
22 103103 11 713713 482482 11.11.22
0.10.188
2.82.899
60060055
22 104104 22 663663 00 00 00 00
60060066
33 105105 22 720720 532532 10.10.66
0.40.444
5.25.200
60060077
33 106106 33 720720 539539 12.12.55
0.10.199
3.83.822
60060088
44 107107 22 841841 562562 15.15.11
0.30.322
3.93.900
60060099
44 108108 33 865865 510510 11.11.99
0.30.311
4.44.444
Sire EPD Ranks – Sire EPD Ranks – Incomplete DataIncomplete Data
TraitTrait
WWWW MilkMilk PWGPWG UREAUREA UBFUBF IMFIMF
44 44 44 44 22 1/31/3
2/12/1 2/12/1 11 11 1/31/3 3/13/1
1/21/2 1/21/2 33 3/23/2 44 22
33 33 22 2/32/3 3/13/1 44
Final CommentsFinal Comments
Actual ultrasound data needs to be treated Actual ultrasound data needs to be treated the same as actual data from any other the same as actual data from any other traittrait Must be in a comparison mode (Ratio/EPD)Must be in a comparison mode (Ratio/EPD)
For use within a contemporary groupFor use within a contemporary group May be helpful to divide data into thirdsMay be helpful to divide data into thirds Always remember there can be measurement Always remember there can be measurement
error. Don’t believe in absoluteserror. Don’t believe in absolutes
Field CertificationField Certification
TraitTrait SEPSEP SERSER BiasBias CorrCorr
Rump/Back FatRump/Back Fat ≤≤0.10.1 ≤≤0.10.1 ≤≤0.10.1 ≥≥0.850.85
Ribeye AreaRibeye Area ≤≤1.21.2 ≤≤1.21.2 ≤≤1.21.2 ≥≥0.800.80
Percent IMFPercent IMF ≤≤1.21.2 ≤≤1.21.2 ≤≤0.70.7 ≥≥0.700.70
Final CommentsFinal Comments
Proper reporting of contemporary groups is Proper reporting of contemporary groups is essentialessential P = G + E is the basis for all genetic evaluationP = G + E is the basis for all genetic evaluation
Don’t selectively report dataDon’t selectively report data Only penalizing the top animalsOnly penalizing the top animals Only hurting yourselfOnly hurting yourself
Don’t let a trait you may not be able to visualize Don’t let a trait you may not be able to visualize well keep you from doing the right thingwell keep you from doing the right thing
Additional ItemsAdditional Items
If a breed publishes both ultrasound and carcass If a breed publishes both ultrasound and carcass EPD values, want ultrasound and carcass EPDs to EPD values, want ultrasound and carcass EPDs to be similarbe similar::
TraitTrait UltrasouUltrasoundnd
CarcassCarcass
REAREA 0.330.33 -0.04-0.04
IMFIMF 0.460.46 0.100.10
Bull 110Bull 110
TraitTrait UltrasouUltrasoundnd
CarcassCarcass
REAREA 0.260.26 0.360.36
IMFIMF 0.270.27 0.270.27
Bull 16Bull 16
Additional ItemsAdditional Items
If breed published just carcass and you If breed published just carcass and you collect/report no carcass info, accuracy will only be collect/report no carcass info, accuracy will only be as high as genetic correlationas high as genetic correlation
Don’t single trait select!Don’t single trait select!